Can a PC willingly fail constitution saving throw against lycanthropy? Zoltar 8 years ago See more @danielceagleCan a PC willingly fail CON saving throw against lycanthropy? nope — Mike Mearls (@mikemearls) May 6, 2016 Share this: Does a PC who failes a CON save against lycanthropy know that she has failed?Lycanthropy how long does the curse take to cause the person to become a Lycanthrope?Can a person willingly fail a saving throw?